ANALYSIS OF SIGNAL DISTORTION ON COUPLED MICROSTRIP LINES WITH AN OVERLAY AND A NOTCH - SUMMARY

In this paper, a full wave approach is used to analyze the propagation parameters of two coupled symmetric microstrip transmission line on d ielectric multilayer substrate with dielectric overlay and a notch bet ween the strips. The purpose of this analysis is to examine the validi ty of previously reported quasi-static techniques to higher frequencie s for applications in the millimeter wave frequency range. The objecti ve is to reduce the distortion of a transmission line that consists of two parallel microstrip lines on two dielectric substrates with a not ch and a dielectric overlay. The distortion in such a transmission lin e is produced due to the difference in the phase velocities of the eve n and odd dominant modes. Techniques based on controlling the dielectr ic constant, height and width of the notch and the overlay are used to reduce distortion. The semi-analytical method of lines (MoL) techniqu e is applied here to solve for the normalized phase velocities of the dominant even and odd modes for this planar microstrip transmission li ne configuration. The numerical results provide a detailed analysis of the transmission line controlling parameters for frequencies up to 10 0GHz.